|I have to do a research about the behavior of library users. We are going to apply a survey to a population of 1280 students (Management an Economics students) but of course we have to do it to a sample....I need to know the size of my sample.
Well, the information I know is that
d= precision...and in this case d= 0.05
p= is the "expected ratio" (proportion esperada, in spanish)....I am not sure if this is 0.03 or 0.05
Z= is the Confidence Intervals. We use the 95% so Z= 1,96
I tried to use the formula...but I can't get a result. I haven't found a book with this formula so that I could see some examples.
I don't know what other kind of information you need. I will be thankful if you can help me